Laminated glass and process of producing the same



May 22, 1928. 4 1,670,436 W. F. BROWN LAMINATED GLASS AND PROCESS OF PRODUCING THE SAME AFiled. May l0, 1926 Hy' E :L lf/Z j Y IfVO /Or 5 E :1 :1 E1

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Patented May 22, 1928.

UNITED STATES- 1,670,436 PATENT oEFl-CE.

WILBUR l'. BROWN, OF TOLEDO, OHIO, A SSIGNOR T0 THE LIBBEY-OWENS SHEET GLASS COMPANY, OF TOLEDO, OHIO, A CORPORATION 0F OHIO.

LAMINATED GLASS AND PROCESS 0F PRODUCING THE SAIE.

Application filed May 10, 192. Seria1 No. 107,951.

The present invention relates to laminated glass. n

An important object of the .invention 1s to provide a process for producing, as a new article of manufacture, a sheet of lammated glass. p

Another' important object of the invention is to provide a process for producing laminated glass wherein a mineral oil is used between a sheet of glass and a substantially non-brittle material to assist in uniting the same.

Another object of the invention is to provide a process for producing laminated glass wherein one side each of two sheets of glass has formed thereon a skin of cellulose composition material, the skins preferably being permitted to dry, after which they are coated with a film of preferably non-Solvent mineral oil, then vinterposing a sheet of nonbrittle material between the coated surfaces of the two`sheets ot' glass, and then uniting the three sheets.

Still another object of the invention is to form a sheet of laminated glass by Spraying or otherwise producing a skin of cellulose composition material upon one side of two sheets of glass, then applying to the skins a film of mineral oil, then coating both sides of a non-brittle sheet of material with a film of mineral oil, interposing the nonbrittle sheet between the sheets of glass, and

uniting the same.

Other objects and advantages of the invention will become apparent during the course of the following description.

In the drawing wherein like numerals are employed to designate like parts throughout the same,

Fig. 1 is a view illustrating diagrammatically the formation of a skin on a. sheet of glass,

Fig. 2 is a similar view showing diagrammatically coating the skin, formed in Fig. 1, with a film of mineral oil,

Fig. 3 is a fragmentary sectional View illustrating the laminations before they are united,

Fig. 4 represents diagrammatically a form of press which may be used to unite the laminations,

Fig. 5 is a fragmentary sectional view of the finished product, and

Fig. 6 is a similar view of a slightly modied form of product.

In accordance with the present invention, in Fig. 1, the numeral 10 designates a sheet of glass. The sheet of glass has sprayed or otherwise deposited thereon, by means of' the spray or the like 11, a coatin of preferably cellulose composition materia 12, which forms a skin on the sheet of glass. After the sheet of glass has been coated with a skin, it is preferably permitted to dry so that all of the solvents contained in the solution will evaporate oli, leaving a substantially dry skin of cellulose material.

The next step in the process is illustrated l in Fig. 2, where the sheet of glass 10, having the skin 12, is beine coated, by means of a brush or the like, with -a film of liquid such as mineral oil 14. The mineral oil 14 is preferably non-solvent, or substantially nonsolvent.

ln Fig. i is shown a sheet 15 which is preferably a cellulose composition material sheet, and which is substantially non-brittle. AThe sheet 15 may or may not be sprayed to form a skin 16 on both sides thereof. After the skins 16 have been formed on the sheet 15, they are given a coating of mineral oil 17, such as that which is applied in Fig. 2.

Fig. 3 shows the three laminat-ions, namely, the twosheets of glass 10 and the Sheet of non-brittle material 15, in position to be united, the three laminationsv each having the skins thereon and films of non-solvent mineral oil.

The laminations may then be placedin a press, designated in its entirety by the numeral 18, comprising preferably a lfower platen 19 and an upper platen 20, operable by means ofthe movable plunger 21. Connections 22 may be provided to permit a circulation of steam or other liquid, at preferably a high temperature, through the p-latens, so that the laminations may be united under the action of heat and pressure. It has been found that vthe non-sol vent mineral oil, applied to the laminations as above described, will assist considerably in obtaining an excellent and permanent union between the various laminations. the same time the mineral oil will almost become entirely expelled from between the laminations so thata negligible amount of liquid remains between the laminations in the iinished product. The form of press used is such that the pressure is preferably initially applied centrally of the laminations Atl and gradually extending toward the outer extremities so that the mineral oil will have an opportunity of becoming expelled.

Fig. 5 designates the finished sheet. It is to be understood that the drawin s are purely diagrammatic, as the skins ormed on the sheets of glass and the sheets of nonbrittle material are relatively very thin, while the film of mineral oil could not be seen in the sectional view such as Fig. 5, if drawn to scale.

In Fig. 6 s illustrated a sheet of so-called bulletroof glass formed in accordance with t e present process, and comprises a central sheet 23, two outer sheets 24, two non-brittle sheets of material 25, and the various skins and coatings of mineral oil.

Although the rocess has been described as including coatlng both the sheets of glass and the non-brittle sheets with a skin, it is to be understood that the invention also contemplates that process wherein the sheets of glass have the skins formed thereon,

while the non-brittle sheets need nt be treated in the same manner. In speaking of the mineral oil as preferably non-solvent, the term non-solvent is used to differentiate from a liquid which has a noticeable solvent action on the materials used in the'manu' able for medicinal purposes are called Y petrolatum liquidam, or liquid petroletum. Liquid petrolatum is practically colorless so that it is exceptionally useful for the purposes here intended.

It is to be understood that the form of the invention herewith shown and described is t0 be taken as the preferred embodiment of the same, and that various changes in the shape, size and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.

Claims:

1. As a new article of manufacture, a sheet of laminated glass including a sheet of glass having a skin of cellulose material thereon which has been coated with a film of mineral oil.

2. As a new article of manufacture, a sheet of laminated glass including a sheet of glass having a skin of cellulose material thereon which has been'coated with a film of non-solvent mineral oil.

3. As a new article of manufacture, a sheet of laminated glass comprising a plurality of laminations united by a mineral oil binder.

4. As a new article of manufacture, a sheet of laminated .glass comprising a plurality of laminations united by a non-solvent mineral oil binder.

Signed at Toledo, in the county of Lucas, and State of Ohio, this 6th day of May, 1926.

WILBUR F. BROWN. 

